Hepatitis C virus in human B lymphocytes transformed by Epstein-Barr virus in vitro by in situ reverse transcriptase-polymerase chain reaction

AIM To study persistence and replication ofheltitis C virus (HCV) in patients' peripheralblood mononuclear cells (PBMC) cultured invitro.METHODS Epstein-Barr virus (EBV) was usedto transform the hepatitis C virus from a HCVpositive patient to permanent lymphoblastoidcell lines (LCL). Positive and negative HCV RNAstrands of the cultured cells and growth mediawere detected by reverse transcriptase-polymerase chain reaction ( RT-PCR ) eachmonth. Core and NS5 proteins of HCV werefurther tested using immunohistochemical SPmethod and in situ RT-PCR.RESULTS HCV RNA positive strands wereconsistently detected the cultured cells for oneyear. The negative-strand RNA in LCL cells andthe positive-strand RNA in supernatants wereobserved intermittently. Immunohistochemicalresults medicated expression of HCV NS3 and Cproteins in LCL cytoplasm mostly. The positivesignal of PCR product was dark blue and mainlylocalized to the LCL cytoplasm. The RT-PCRsignal was eliminated by overnight RNasedigestion but not DNase digestion.CONCLUSION HCV may exist and remainfunctional in a cultured cell line for a longperiod.

Droplet digital polymerase chain reaction assay for methylated ring finger protein 180 in gastric cancer

BACKGROUND Gastric cancer(GC)is one of the most prevalent malignant tumors that endangers human health.Early diagnosis is essential for improving the prognosis and survival rate of GC patients.Ring finger protein 180(RNF180)is involved in the regulation of cell differentiation,proliferation,apoptosis,and tumorigenesis,and aberrant hypermethylation of CpG islands in the promoter is strongly associated with the occurrence and development of GC.Thus,methylated RNF180 can be used as a potential biomarker for GC diagnosis.AIM To use droplet digital polymerase chain reaction(ddPCR)to quantify the methylation level of the RN180 gene.A reproducible ddPCR assay to detect methylated RNF180 from trace DNA was designed and optimized.METHODS The primer and probe were designed and selected,the conversion time of bisulfite was optimized,the ddPCR system was adjusted by primer concentration,amplification temperature and amplification cycles,and the detection limit of ddPCR was determined.RESULTS The best conversion time for blood DNA was 2 h 10 min,and that for plasma DNA was 2 h 10 min and 2 h 30 min.The results of ddPCR were better when the amplification temperature was 56°C and the number of amplification cycles was 50.Primer concentrations showed little effect on the assay outcome.Therefore,the primer concentration could be adjusted according to the reaction system and DNA input.The assay required at least 0.1 ng of input DNA.CONCLUSION In summary,a ddPCR assay was established to detect methylated RNF180,which is expected to be a new diagnostic biomarker for GC.

Development of a droplet digital polymerase chain reaction assay for the sensitive detection of total and integrated HIV-1 DNA

Background:Total human immunodeficiency virus(HIV)DNA and integrated HIV DNA are widely used markers of HIV persistence.Droplet digital polymerase chain reaction(ddPCR)can be used for absolute quantification without needing a standard curve.Here,we developed duplex ddPCR assays to detect and quantify total HIV DNA and integrated HIV DNA.Methods:The limit of detection,dynamic ranges,sensitivity,and reproducibility were evaluated by plasmid constructs containing both the HIV long terminal repeat(LTR)and human CD3 gene(for total HIV DNA)and ACH-2 cells(for integrated HIV DNA).Forty-two cases on stable suppressive antiretroviral therapy(ART)were assayed in total HIV DNA and integrated HIV DNA.Correlation coefficient analysis was performed on the data related to DNA copies and cluster of differentiation 4 positive(CD4^(+))T-cell counts,CD8^(+)T-cell counts and CD4/CD8 T-cell ratio,respectively.The assay linear dynamic range and lower limit of detection(LLOD)were also assessed.Results:The assay could detect the presence of HIV-1 copies 100%at concentrations of 6.3 copies/reaction,and the estimated LLOD of the ddPCR assay was 4.4 HIV DNA copies/reaction(95%confidence intervals[CI]:3.6-6.5 copies/reaction)with linearity over a 5-log_(10)-unit range in total HIV DNA assay.For the integrated HIV DNA assay,the LLOD was 8.0 copies/reaction(95%CI:5.8-16.6 copies/reaction)with linearity over a 3-log 10-unit range.Total HIV DNA in CD4^(+)T cells was positively associated with integrated HIV DNA(r=0.76,P<0.0001).Meanwhile,both total HIV DNA and integrated HIV DNA in CD4^(+)T cells were inversely correlated with the ratio of CD4/CD8 but positively correlated with the CD8^(+)T-cell counts.Conclusions:This ddPCR assay can quantify total HIV DNA and integrated HIV DNA efficiently with robustness and sensitivity.It can be readily adapted for measuring HIV DNA with non-B clades,and it could be beneficial for testing in clinical trials.

SEQUENCE ANALYSIS OF THE NS5 REGION OF GBVC/HGV AND DETECTION OF THE VIRUS BY REVERSE TRANSCRIPTASE PCR

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土壤固碳微生物的绝对定量检测实验设计

为了定量检测土壤中的固碳微生物,设计以功能基因cbbL为靶标的固碳微生物微滴数字聚合酶链式反应(ddPCR)检测方法。选择合适的引物探针,从退火温度、探针浓度以及引物浓度进行反应条件的优化,分析ddPCR检测方法的线性范围、敏感性、重复性和特异性。结果显示,当退火温度为55.8℃、探针与引物浓度分别为350、750 nmol/L时,建立的cbbL-ddPCR扩增反应效率最高,阴阳性微滴分布界限最明显,平均拷贝数较高;检测的线性范围为2.3×10^(0)~2.3×10^(5)copies/μL-DNA,曲线方程y=0.1077x-95.562,相关系数R^(2)为0.9997,检出限为0.5 copy/μL-DNA,21个重复的变异系数仅为3.92%,与其他4种非固碳微生物DNA未发生交叉反应。所建立的cbbL-ddPCR方法可用于土壤微生物固碳潜能测定。

Micro-droplet Digital Polymerase Chain Reaction and Real-Time Quantitative Polymerase Chain Reaction Technologies Provide Highly Sensitive and Accurate Detection of Zika Virus

The establishment of highly sensitive diagnostic methods is critical in the early diagnosis and control of Zika virus(ZIKV)and in preventing serious neurological complications of ZIKV infection. In this study, we established micro-droplet digital polymerase chain reaction(ddPCR) and real-time quantitative PCR(RT-qPCR) protocols for the detection of ZIKV based on the amplification of the NS5 gene. For the ZIKV standard plasmid, the RT-qPCR results showed that the cycle threshold(Ct) value was linear from 10~1 to 10~8 copy/l L, with a standard curve R^2 of 0.999 and amplification efficiency of 92.203%;however, a concentration as low as 1 copy/l L could not be detected. In comparison with RT-qPCR, the dd PCR method resulted in a linear range of 10~1–10~4 copy/l L and was able to detect concentrations as low as 1 copy/l L. Thus, for detecting ZIKV from clinical samples, RT-qPCR is a better choice for high-concentration samples(above 10~1 copy/l L),while ddPCR has excellent accuracy and sensitivity for low-concentration samples. These results indicate that the ddPCR method should be of considerable use in the early diagnosis, laboratory study, and monitoring of ZIKV.

新型冠状病毒Omicron I1566V突变位点MS2噬菌体病毒样颗粒的构建

目的构建新型冠状病毒Omicron I1566V突变位点MS2噬菌体病毒样颗粒。方法选取并合成带有6×His标签的MS2噬菌体的衣壳蛋白(CP)、成熟蛋白(A蛋白)及Omicron I1566V突变基因序列,插入pACYCDuet-1质粒构建重组载体,通过原核系统诱导表达目的蛋白,纯化重组蛋白后利用透射电镜对蛋白质进行物理表征,最后通过反转录聚合酶链反应(RT-PCR)检测病毒样颗粒的热稳定性及耐核酸酶水解能力。结果成功构建包含有6×His标签的CP、A蛋白和Omicron I1566V突变基因序列的重组载体,经限制性内切酶BamHⅠ和KpnⅠ酶切鉴定和测序验证,结果均与预期相符。经诱导并纯化后,通过电镜观察到了大小均匀、直径为23~28 nm的病毒样颗粒,该病毒样颗粒经核酸酶消化后可在37℃条件下稳定储存20 d以上。结论该研究成功利用MS2噬菌体的CP和A蛋白构建了Omicron I1566V突变位点病毒样颗粒,为该突变位点的RT-PCR检测体系提供了可靠的质量保障。

建立大规模筛选病毒的核酸检测方法

目的 开发快速、简便、可大规模对病毒进行筛选的核酸检测方法。方法 通过集液滴生成、循环扩增、信号读取为一体的液滴数字聚合酶链反应(droplet digital polymerase chain reaction, ddPCR)系统,以严重急性呼吸综合征冠状病毒2(severe acute respiratory syndrome coronavirus 2, SARS-CoV-2)的ORF1ab和N基因为靶序列,以人甘油醛-3-磷酸脱氢酶(glyceraldehyde-3-phosphate dehydrogenase, GAPDH)为内参基因,进行核酸扩增并监测每个液滴的荧光信号。结果 一体式DDPCR仪实现了“样本进-结果出”的简易操作。其水油体系与SARS-CoV-2检测试剂盒中试剂兼容,至扩增结束液滴稳定未融合,实现了实时检测区分出大量液滴中不同的荧光信号。恒温扩增条件下,最早可在第9min观察到带有三重荧光信号(FAM、HEX、CY5)的液滴。扩增过程中的实时荧光信号通过拟合后与实时荧光定量聚合酶链反应扩增曲线类似,包括基线期、指数期和平台期。各基因几百个液滴的扩增曲线显示,各液滴中无特异性扩增,同时Ct值分析结果显示,最早可在第12min得到扩增信号,达到鉴别目的。结论 一体式ddPCR仪操作简便,液滴中反应迅速,可达到快速检测的目的。恒温扩增对反应设备要求较低,可大规模批量反应,同时拍照式信号采集可记录大量液滴的荧光信号,达到大规模筛选的目的。

利用微滴数字PCR仪定量检测贝类中两种弧菌方法的建立

建立贝类中霍乱弧菌和副溶血性弧菌微滴数字聚合酶链式反应快速精准定量检测方法,评价其可行性。采用SN/T 2425-2010和SN/T 2424-2010的引物和探针,建立双重微滴数字PCR反应体系。霍乱弧菌和副溶血性弧菌双重微滴数字PCR的最低检测限度分别可达到2.9 copies/μL和1.7 copies/μL,相当于1×10^(5)CFU/mL纯菌液,所建立的双重微滴数字PCR检测方法具有特异性和灵敏性,重复性试验结果也很稳定,不与其他常见病原菌发生交叉反应。本研究建立的双重微滴数字PCR方法可有效定量检测贝类样品中霍乱弧菌和副溶血性弧菌。

微滴式数字聚合酶链反应在重症感染病原学诊断中的应用进展

重症感染是导致人类死亡的主要病因之一,尤其对于重症监护病房患者,传统的病原微生物检测手段存在灵敏度和特异度低、耗时长等问题,严重影响脓毒症患者病原学早期快速诊断,导致其病死率增加。近年,随着分子诊断技术在重症感染疾病中的广泛应用,病原学的诊断效率及准确性均显著提高。其中,微滴式数字聚合酶链反应(ddPCR)凭借高灵敏度、高特异度、绝对定量等优势,在病原菌载量动态监测和抗生素疗效评估中具有巨大潜力。因此,ddPCR技术或可提高重症患者的诊断率,改善其预后。

微滴式数字PCR技术定量检测发酵乳中醋化醋杆菌

建立一种微滴式数字聚合酶链式反应(droplet digital polymerase chain reaction,ddPCR)定量检测发酵乳中醋化醋杆菌的技术。根据醋化醋杆菌ITS基因序列设计特异性引物和探针,通过反应温度筛选优化ddPCR扩增条件,通过多种菌株扩增验证方法特异性,通过人工添加醋化醋杆菌验证方法检出限,通过ddPCR法实测结果和计数法测定结果之间的比较对其绝对定量进行系统性研究。结果表明:建立的发酵乳中醋化醋杆菌ddPCR定量检测1方法,反应条件中最适退火温度为54.6℃,方法特异性强,检出限为7.2×10^(1) CFU/mL,灵敏度高,定量偏差率为23.73%。该方法可以满足发酵乳中醋化醋杆菌定量检测需求。

肝癌患者血清中lncRNA HOTAIR表达与临床病理特征的相关性及诊断价值

目的分析血清长链非编码RNA HOX转录反义RNA(IncRNA HOTAIR)在肝癌患者中的表达与临床诊断意义。方法选取100例肝癌患者为研究对象,并将其纳入肝癌组,另选取同期收治的80例肝硬化患者纳入肝硬化组,同时选取同期行体检的75例健康体检者纳入对照组。采集3组5 ml静脉血,以实时荧光定量逆转录聚合酶链反应(RT-PCR)检测对比3组血清IncRNA HOTAIR相对表达量。同时,收集肝癌患者的年龄、性别等一般资料,分析血清IncRNA HOTAIR与其临床病理特征的关系;另外绘制受试者工作曲线(ROC),分析血清IncRNA HOTAIR在肝癌中的诊断效能。结果肝癌组的IncRNA HOTAIR相对表达量[(2.53±0.58)]高于肝硬化组[(0.81±0.25)]与对照组[(0.20±0.05)],差异有统计学意义(P<0.05)。IncRNA HOTAIR表达与肝癌患者的TNM分期、血管侵犯、肝外转移有关,差异有统计学意义(P<0.05);IncRNA HOTAIR表达与患者的年龄、性别、肿瘤数目无关,差异无统计学意义(P>0.05)。ROC结果显示:血清IncRNA HOTAIR诊断肝癌的AUC为0.901(95%CI:0.852~0.949),具有较高的诊断价值。结论肝癌患者血清内IncRNA HOTAIR呈高表达,其表达水平与患者TNM分期、血管侵犯、肝外转移相关,可能参与肝癌的发生、发展,在肝癌中具有较高的临床诊断意义。

Plasma exosomal hsa_circ_0079439 as a novel biomarker for early detection of gastric cancer

BACKGROUND Due to the poor prognosis of gastric cancer(GC),early detection methods are urgently needed.Plasma exosomal circular RNAs(circRNAs)have been suggested as novel biomarkers for GC.AIM To identify a novel biomarker for early detection of GC.METHODS Healthy donors(HDs)and GC patients diagnosed by pathology were recruited.Nine GC patients and three HDs were selected for exosomal whole-transcriptome RNA sequencing.The expression profiles of circRNAs were analyzed by bioinformatics methods and validated by droplet digital polymerase chain reaction.The expression levels and area under receiver operating characteristic curve values of plasma exosomal circRNAs and standard serum biomarkers were used to compare their diagnostic efficiency.RESULTS There were 303 participants,including 240 GC patients and 63 HDs,involved in the study.The expression levels of exosomal hsa_circ_0079439 were significantly higher in GC patients than in HDs(P<0.0001).However,the levels of standard serum biomarkers were similar between the two groups.The area under the curve value of exosomal hsa_circ_0079439 was higher than those of standard biomarkers,including carcinoembryonic antigen,carbohydrate antigen(CA)19-9,CA72-4,alpha-fetoprotein,and CA125(0.8595 vs 0.5862,0.5660,0.5360,0.5082,and 0.5018,respectively).The expression levels of exosomal hsa_circ_0079439 were significantly decreased after treatment(P<0.05).Moreover,the expression levels of exosomal hsa_circ_0079439 were obviously higher in early GC(EGC)patients than in HDs(P<0.0001).CONCLUSION Our results suggest that plasma exosomal hsa_circ_0079439 is upregulated in GC patients.Moreover,the levels of exosomal hsa_circ_0079439 could distinguish EGC and advanced GC patients from HDs.Therefore,plasma exosomal hsa_circ_0079439 might be a potential biomarker for the diagnosis of GC during both the early and late stages.

SMRT sequencing and ddPCR reveal the complexity of developmental trajectories and temporal dynamics of gut bifidobacterial communities in infants

Infant intestinal microbiome is closely linked with health and risk of disease. Bifidobacterium are important components of the infant gut and are known to confer various health effects on the host. However, few studies have described the precise composition and dynamics of early infant gut bifidobacterial communities. Thus, this was a pilot study aiming to describe the developmental trajectories and temporal dynamics of bifidobacterial communities in infants before 6 months of age. A total of 28 fecal samples from 4 infants(GF, ZZ, QM, TN, respectively)were collected and analyzed after 5, 15, 30, 60, 90, 120, 150, and 180 days of birth by a bifidobacteria-target method(based on single-molecule real-time sequencing of partial bifidobacterial rpsK genes)in conjunction with droplet digital polymerase chain reaction(ddPCR). The infant fecal microbiota comprised a total of 11 bifidobacterial species, including 4 major species, i.e., B. dentium(37.35%), B. catenulatum(32.04%), B. breve(22.24%), and B. animalis(8.02%). The infant microbiota showed highly individualized developmental trajectories. The leading species for GF was B. catenulatum, with a relatively stable developmental trajectory. In ZZ, B. breve was enriched, and the developmental trajectory was rather fluctuating. The most abundant species for QM and TN was B. dentium. The developmental trajectory of B. dentium in QM showed a trend of gradual decrease, whereas an opposite trend was seen in samples of TN. The results of ddPCR confirmed large variations in quantities of bifidobacteria between infants and suggested discordances in temporal dynamics of bifidobacterial communities during the first half year of infancy. In conclusion, our results suggested that the early infant gut bifidobacterial microbiota was highly complex and temporal dynamics, with individualized developmental trajectories, which should be considered in future research of infant gut microbiota.

水产品中广州管圆线虫微滴数字聚合酶链反应定量检测方法的建立

目的建立微滴数字聚合酶链反应(droplet digital polymerase chain reaction,ddPCR)快速、准确定量检测水产品中广州管圆线虫的分析方法。方法选择广州管圆线虫ITS2基因序列作为靶标序列,自主设计特异性引物和探针,建立广州管圆线虫ddPCR定量检测方法,通过对ddPCR反应条件的优化,确立了ddPCR最佳反应条件,从稳定性、特异性、定量限范围、定量检测低限和人工污染样品等方法,综合评价建立的广州管圆线虫ddPCR定量检测方法的效果。结果广州管圆线虫DNA质量浓度在0.320~1000.000 pg/μL的范围内,基因拷贝数与DNA浓度呈良好的线性关系,相关系数r2=1,定量检测低限为0.297拷贝/μL,人工污染样品中3次重复实验分别检出4370、4210、4310拷贝/μL。结论本研究建立的广州管圆线虫ddPCR定量检测方法特异性强、灵敏度高、稳定性好、定量范围广,为水产品中广州管圆线虫的定量检测提供新的检测手段。

2019—2021年安徽省合肥市某三甲医院住院的严重急性呼吸道感染患者的监测分析

目的分析2019—2021年在安徽省合肥市第二人民医院住院的严重急性呼吸道感染(SARI)患者的监测结果。方法筛查2019年1月—2021年12月安徽省合肥市第二人民医院住院部监测科室(呼吸内科、儿内科与重症监护科)SARI患者的资料,并采集患者鼻咽拭子、呼吸道分泌物,通过反转录聚合酶链反应(RT-PCR)检测甲乙通用性流感病毒。结果2019—2021年,共监测SARI患者934例,占监测科室同期入院病例的12.04%;2019年、2020年和2021年,SARI患者分别占入院患者的10.62%、14.90%和11.40%。2020年,检测出的SARI患者占比较高。2019—2021年,SARI监测病例主要集中于冬春季节,以5岁以下儿童病例占比较大(54.82%),男女比例为1.66∶1。SARI的监测科室分别为儿内科(82.12%)、呼吸内科(17.77%)以及重症监护科(0.11%);2019—2021年采集的934份咽拭子标本经实验室检测,阳性标本39份,阳性率为4.17%,主要感染病毒类型为B型Victoria系[27例(69.23%)]。SARI与流感阳性感染患者中合并症最常见的为肺炎,SARI合并并发症的467例患者中,99.36%的患者转归为治愈或好转,不合并并发症的患者中,99.57%的患者转归为治愈或好转,差异无统计学意义(P=1.000)。SARI病例采样前最常用的药物为抗生素与神经氨酸酶抑制剂类抗病毒药物。SARI病例中,使用抗病毒药物的患者中有98.66%疾病转归为治愈或好转,而不使用抗病毒药物的患者中,99.53%的患者疾病转归为治愈或好转,差异无统计学意义(P=0.343)。结论2019—2021年,在安徽省合肥市第二人民医院住院的SARI病例多为男性、儿童、老人,冬春季为高发季节,流感阳性患者主要感染菌株均为FluB,且所有患者转归情况较好。

急性胰腺炎病人血清长链非编码RNA核富集转录体1、Toll样受体2表达变化及临床意义研究

目的探讨急性胰腺炎(AP)病人血清长链非编码RNA核富集转录体1(LncRNA NETA1)、Toll样受体2(TLR2)表达及临床意义。方法选取2017年5月至2020年12月石家庄平安医院收治的AP病人125例为研究对象,根据急性生理学和慢性健康状况评价Ⅱ(APACHEⅡ)对AP病人进行评分,并将病人分为轻症组56例,重症组69例;根据住院期间重症组AP病人预后情况,将病人分为预后不良25例,预后良好44例。同期选取该院健康体检者130例为健康组。实时荧光定量逆转录聚合酶链反应(qRT-PCR)检测血清LncRNA NETA1水平,酶联免疫吸附测定(ELISA)检测血清TLR2水平;Pearson相关性分析探索AP病人血清LncRNA NEAT1、TLR2水平相关性及二者与病人APACHEⅡ评分的关系;受试者操作特征曲线(ROC曲线)分析血清LncRNA NEAT1、TLR2对AP病人重症的评估价值。结果与健康组比较,AP组血清LncRNA NEAT1(2.16±0.31比1.00±0.00)、TLR2水平[(6.43±1.05)µg/L比(0.59±0.24)µg/L]升高(P<0.05);与轻症组比较,重症组AP病人血清LncRNA NEAT1(2.31±0.33比1.98±0.27)、TLR2水平[(6.89±1.16)µg/L比(5.86±0.92)µg/L]升高(P<0.05);与预后良好组比较,预后不良组重症AP病人血清LncRNA NEAT1(2.43±0.36比2.14±0.27)、TLR2水平[(7.12±1.24)µg/L比(6.45±1.02)µg/L]升高(P<0.05);Pearson相关性分析结果表明,AP病人血清LncRNA NEAT1、TLR2呈正相关(r=0.65,P<0.05),二者与病人APACHEⅡ评分均呈正相关(r=0.50、0.52,P<0.05);ROC曲线结果显示,血清LncRNA NEAT1水平、TLR2单独及联合评估AP病人重症的曲线下面积(AUC)分别为0.73[95%CI:(0.64,0.82)]、0.75[95%CI:(0.67,0.84)]、0.88[95%CI:(0.82,0.94)],血清LncRNA NEAT1联合TLR2水平预测AP病人重症的AUC明显大于二者单独预测(P<0.05)。结论AP病人血清LncRNA NEAT1、TLR2表达水平显著升高,且与病人严重程度和预后有关,临床上检测LncRNA NEAT1、TLR2表达可能有助于AP病人的病情评估。

常见白血病融合基因筛查在白血病诊断与分型中的意义

目的: 分析病人白血病细胞染色体畸变涉及的86种融合基因和临床白血病类型的相关性,探讨常见融合基因筛查法在临床诊断和分型中的应用价值。方法: 收集161例初发或者复发的白血病患者及8例骨髓增生异常综合征(MDS)患者的骨髓细胞,提取RNA,用32条特异性引物逆转录为cDNA,利用白血病29种染色体畸变形成的融合基因的86种mRNA剪接变异体引物,分8管进行多重RT PCR,筛查白血病融合基因。结合临床状态和形态学观察了解融合基因与白血病类型的关系。结果: 白血病中115例(71% )分别检测出10种白血病常见融合基因,包括AML1 /ETO、PML/RARα、PLZF/RARα、dupMLL、MLL/AF6、MLL/AF10、CBFβ/MYH11、BCR/ABL、Hox11、Evi1。其中52例慢性粒细胞白血病(CML)100%检出BCR/ABL; 25例急性早幼粒细胞白血病(APL)中88%检出融合基因,其中21例APL检测出PML/RARα, 1例APL检测出PLZF/RARα; AML1 /ETO阳性的17例急性白血病(AL)16例为FAB M2亚型, 1例为混合型白血病; CBFβ/MYH11阳性的4例AL3例为FAB分型的M4, 1例为M5,属于向粒单细胞系统分化的白血病。16例AL检测出MLL基因异常,其中MLL/AF6白血病均为FAB分型的M5,具有典型的原始单核细胞白血病的特征。17例急性淋巴细胞白血病(ALL) 5例检测出BCR/ABL。8例MDS病人中2例检测出融?

中药滋补肝肾方对鼠B16黑素瘤细胞酪氨酸酶mRNA表达的调节

目的 探讨中药滋补肝肾方治疗白癜风的分子学作用机制。方法 采用定量逆转录 聚合酶链式反应(RT PCR)方法 ,观察中药滋补肝肾方对鼠B16黑素瘤细胞株酪氨酸酶mRNA表达的影响。结果 中药滋补肝肾方能使黑素瘤细胞酪氨酸酶mRNA表达水平增加。结论 中药滋补肝肾方能上调黑素细胞酪氨酸酶mRNA表达水平 ,这是其治疗白癜风的药理作用机制之一。

大肠杆菌O157∶H7微滴数字PCR定量方法的建立

以大肠杆菌O157∶H7（E.coli O157∶H7）rfb E基因为靶基因,建立了可对其准确定量的微滴数字PCR（dd PCR）方法。对dd PCR反应中的探针浓度进行了优化,考察了方法的线性范围、精密度、定量限和检出限。最终确定dd PCR反应中的最佳探针浓度为300 nmol/L。E.coli O157∶H7基因组DNA浓度范围为4-1.25×105拷贝/20μL dd PCR反应液时,dd PCR方法线性相关系数（R2）为0.999。当DNA浓度为760-88400拷贝/20μL时,方法的精密度最好（RSD〈5%）。本方法的定量限为4拷贝/20μL,检出限为3拷贝/20μL。特异性验证结果表明,建立的dd PCR方法特异性良好,对13份猪肉、牛肉和鸡肉样品的检测结果与定量PCR方法检出结果一致。